A machinist wants to find the proper type of lubrication, schedule and recommended maintenance practices for the head-stock of a lathe. The best source to find this information is:

The most reliable source for finding the proper type of lubrication, schedule, and recommended maintenance practices for the head-stock of a lathe is the preventative maintenance schedule and machine manual. These documents are specifically created by the manufacturer and provide detailed and accurate information tailored to that particular machine model. They include manufacturer recommendations based on thorough testing and engineering evaluations, ensuring that the machinist has the best guidance for maintaining the lathe's performance and longevity.

Using the preventative maintenance schedule ensures that the machinist adheres to systematic timings for maintenance, which is crucial for preventing equipment failures. The machine manual also typically contains diagrams, specifications, and troubleshooting tips that online forums or colleagues may not provide, making it an essential reference for maintaining the lathe correctly.